Micropowder filtration

In the wet chemical production of ultra-fine powders, it is necessary to repeatedly wash the ultra-fine product slurry, which is rich in impurity ions, in order to remove these ions and improve the purity of the product. For certain powder systems with excellent dispersibility and nanoscale particle sizes, conventional washing methods such as plate-and-frame filtration and high-speed centrifugation are unable to effectively separate the solids from these nanopaste solutions. These methods present drawbacks including easy leakage of the powder, turbid filtrate, large amounts of water required for washing, and high labor intensity. As a new type of solid-liquid separation element, inorganic microporous ceramic membranes possess advantages such as high separation precision, good wear resistance, and stable operation. They utilize a \"cross-flow filtration\" technique: the ultra-fine powder slurry continuously circulates within the ceramic membrane. The highly precise membrane layers (with filtration pore sizes ranging from 1 nm to 200 nm) are capable of completely trapping ultra-fine powder particles, while the aqueous solution containing impurity ions passes through the membrane. By adding pure water and carrying out repeated filtration and washing processes, the impurity ions in the slurry can be removed to a large extent, thereby increasing the purity of the final product. •It features extremely high filtration precision, with a minimum filtration pore size of 1 nanometer: • It has a high retention rate for ultra-fine powders; precious powders are hardly lost, and there is no leakage. • It offers excellent cleaning performance, resulting in low impurity levels, enabling the production of ultra-fine powders with very high purity. • The filtered water is clear and transparent, free of particles and pollution. • Less water is required for washing, allowing for a savings of over 30% in cleaning water. • The process parameters during washing can be controlled, which helps to improve the dispersibility of the powders. • In the filtration process, pressure is used as the driving force for membrane separation, resulting in a simple separation device and easy operation. • It can be fully automated using PLC control, reducing the labor intensity. • It can be combined with reverse osmosis equipment to produce pure water, resulting in low overall operating costs. I’m not sure if it’s appropriate for the OP?

This two-in-one approach is not easy to implement; it is better to feed the mother liquor after mixing separately into the filter, using a metal membrane for filtration, followed by pressing out the liquid or removing the concentrated slurry. qq470505919